气体辅助条件下GF/PP的3D打印

Gas-Assisted 3D Printing of GF/PP Composite

在气辅3D打印中,高温气流对聚合物丝材形态产生显著影响,因此,需要深入研究其内部机理。优化设计了气辅3D打印喷嘴,采用含量为10%的玻璃纤维增强聚丙烯(GF/PP),对比研究了传统3D打印与气辅3D打印制品的表观性能和力学性能,结果表明,引入气体辅助后,减小了打印过程中的收缩变形,将3D打印制品在水平和垂直2个方向上的尺寸精度分别提高了4.3、1.7倍,形状尺寸更接近原始模型尺寸;气流的引入使高分子丝材变为滑移挤出,表面粗糙度降低至传统3D打印材料的46%,表面更加光滑平整;拉伸强度和断裂伸长率分别提高了8.24%、50.71%。在以上因素共同作用下,打印制品的表观质量和力学性能更佳。

In gas-assisted 3D printing,gas had a significant impact on the morphology of polymer filaments,so it was crucial to thoroughly study their internal mechanisms.For this purpose,this research optimized the design of gas-assisted 3D printing nozzles and conducted a series of experiments using 10%glass fiber reinforced polypropylene(GF/PP)to compare the differences in apparent and mechanical properties between traditional 3D printing and gas-assisted 3D printing products.The results showed that after introducing gas assistance,the introduction of gas assistance resulted in reduced shrinkage and deformation during the printing process,the dimensional accuracy in both horizontal and vertical directions increased by 4.3 and 1.7 times,respectively,and the shape and size were closer to the original model size;The introduction of gas assistance resulted in reduced shrinkage and deformation during the printing process;The surface roughness had also been reduced to 46%of traditional 3D printing,making the surface smoother and smoother.The tensile strength and elongation at break increased by 8.24%and 50.71%respectively,and these factors combined to improve the apparent quality and mechanical properties of printed products.